Download or read book Search for Chargino neutralino Pair Production with the D0 Detector at the Tevatron written by Zhongmin Wang and published by . This book was released on 2004 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have searched for evidence for the chargino {bar {chi}}{sub 1}{sup {+-}} and neutralino ({bar {chi}}{sub 2}{sup 0}) pair production in proton anti-proton collisions at a center of mass energy of 1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. Data corresponding to an integrated luminosity of 124.5 pb{sup -1} were examined for events containing like-sign electron pair and missing energy for the first time at D0. They observed no excess above the yield from Standard Model processes. In the framework of mSUGRA, they set a series of upper limits, at the 95% confidence level, of the chargino neutralino production cross section times the branching fraction to tri-electrons as a function of the chargino mass. These limits range from 0.79 pb for m{sub {bar {chi}}{sub 1}{sup {+-}}} = 86.9 GeV/c{sup 2} to 0.52 pb for m{sub {bar {chi}}{sub 1}{sup {+-}}} = 115.1 GeV/c{sup 2}.
Download or read book Search for Chargino Neutralino Pair Production at CDF written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for associated production of the lightest chargino and next-to-lightest neutralino using 1 fb−1 of (square root)s = 1.96 TeV p{bar p} data collected with the CDF detector at the Tevatron. We combine the results of several multi-lepton final states to set upper limits on the cross section times branching ratio for chargino-neutralino production as a function of the chargino mass.
Download or read book Search for Chargino neutralino Associated Production Via Trileptonic Final States with DO Detector written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results from a search for the production of an associated lightest chargino, W1, and second lightest neutralino, Z2, pair with the D0 detector at Fermilab's pp collider with (square root)s = 1.8 TeV are presented. Based on approximately 85 pb−1 of data collected during the 1993-1995 Tevatron Runs we set a 95% C.L. upper limit on the chargino-neutralino cross section times branching fraction to any trileptonic final state ranging from 0.91 pb to 0.19 pb for wino masses ranging from 45 GeV/c2 to 96 GeV/c2.
Download or read book Search for Chargino and Neutralino Associated Production at the Tevatron written by Daniela Bortoletto and published by . This book was released on 2005 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author presents a review of the searches for charginos and neutralinos using data from proton-antiproton collision at the center of mass energy of 1.96 TeV collected by the CDF and the D0 experiments at the Tevatron during run II.
Download or read book IFAE 2007 written by G. Carlino and published by Springer Science & Business Media. This book was released on 2008-09-16 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects the Proceedings of the Workshop "Incontri di Fisica delle Alte Energie (IFAE) 2007, Napoli, 11-13 April 2007". Presentations, both theoretical and experimental, addressed the status of Physics of the Standard Model and beyond, Flavour physics, Neutrino and Astroparticle physics, and new technology in high energy physics. Special emphasis amid this rich exchange of ideas was given to the expectations of the forthcoming Large Hadron Collider.
Download or read book Search for Supersymmetry in pp Collisions at s 8 TeV with a Photon Lepton and Missing Transverse Energy written by Yutaro Iiyama and published by Springer. This book was released on 2017-06-14 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.
Download or read book Search for Chargino and Neutralino Production in the Trilepton Channel with the CDF Run 2 Detector written by Melisa Rossi and published by . This book was released on 2006 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Events with Leptonic Jets and Missing Transverse Energy in mathbf p bar p Collisions at mathbf sqrt s written by and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first search for pair production of isolated jets of charged leptons in association with a large imbalance in transverse energy in p{bar p} collisions using 5.8 fb−1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider. No excess is observed above Standard Model background, and the result is used to set upper limits on the production cross section of pairs of supersymmetric chargino and neutralino particles as a function of 'dark-photon' mass, where the dark photon is produced in the decay of the lightest supersymmetric particle.
Download or read book Astrophysics written by İbrahim Küçük and published by BoD – Books on Demand. This book was released on 2012-03-30 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with a clear progress to theoretical and observational astrophysics. It is not surprising that astrophysics is continually growing because very sophisticated telescopes are being developed and they bring the universe closer and make it accessible. Astrophysics Book presents a unique opportunity for readers to demonstrate processes do occur in Nature. The unique feature of this book is to cover different aspects in astrophysics covering the topics: • Astronomy • Theoretical Astrophysics • Observational Astrophysics • Cosmology • The Solar System • Stars • Planets • Galaxies • Observation • Spectroscopy • Dark Matter • Neutron Stars • High Energy Astrophysics
Download or read book Search for the Trilepton Signal of the Minimal Supergravity Model in D0 Run II written by Meta Binder and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for associated chargino neutralino pair production is performed in the trilepton decay channel q{bar q} {yields} {tilde {chi}}{sub 1}{sup {+-}} {tilde {chi}}{sub 2}{sup 0} {yields} {ell}{sup {+-}} {nu} {tilde {chi}}{sub 1}{sup 0} {mu}{sup {+-}} {mu}{sup {-+}} {tilde {chi}}{sub 1}{sup 0}, using data collected with the D0 detector at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. The data sample corresponds to an integrated luminosity of {approx}300 pb{sup -1}. A dedicated event selection is applied to all samples including the data sample and the Monte Carlo simulated samples for the Standard Model background and the Supersymmetry signal. Events with two muons plus an additional isolated track, replacing the requirement of a third charged lepton in the event, are analyzed. Additionally, selected events must have a large amount of missing transverse energy due to the neutrino and the two {tilde {chi}}{sub 1}{sup 0}. After all selection cuts are applied, 2 data events are found, with an expected number of background events of 1.75 {+-} 0.34 (stat.) {+-} 0.46 (syst.). No evidence for Supersymmetry is found and limits on the production cross section times leptonic branching fraction are set. When the presented analysis is considered in combination with three other decay channels, no evidence for Supersymmetry is found. Limits on the production cross section times leptonic branching fraction are set. A lower chargino mass limit of 117 GeV at 95% CL is then derived for the mSUGRA model in a region of parameter space with enhanced leptonic branching fractions.
Download or read book Search for Supersymmetric tilde W 1 and tilde Z 2 States Using the D0 Detector written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for signals from Supersymmetry at hadron colliders has largely been centered on the search for squark and gluino production, usually through events with large missing transverse energy (E{sub t}). A promising alternative at the Tevatron is the search for production of the lightest chargino ({tilde W}1) and next-to-lightest neutralino ({tilde Z}2), with the assumptions that R-parity is conserved and the lightest neutralino ({tilde Z}1) is the lightest supersymmetric particle (LSP). Although the mass limit established by LEP experiments, 2M{sub {tilde W}1}>45 GeV/c2, excludes the on-shell process {anti p}p 2!W{sup {+-}} 2!{tilde W}1 + {tilde Z}2, the off-shell process W{sup {+-}} 2!{tilde W}1{tilde Z}2 can have a sizeable rate due to large WW{tilde W}1{tilde Z}2 coupling. Here, the status of a search for the pair production of the lightest chargino and second lightest neutralino states of the minimal supersymmetric model is presented. The authors searched for four tri-lepton final states: eee, ee[mu], e[mu][mu], and [mu][mu][mu], all with missing transverse energy.
Download or read book Search for Supersymmetric tilde W sub 1 and tilde Z sub 2 States Using the D0 Detector written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for signals from Supersymmetry at hadron colliders has largely been centered on the search for squark and gluino production, usually through events with large missing transverse energy (E[sub t]). A promising alternative at the Tevatron is the search for production of the lightest chargino ([tilde W][sub 1]) and next-to-lightest neutralino ([tilde Z][sub 2]), with the assumptions that R-parity is conserved and the lightest neutralino ([tilde Z][sub 1]) is the lightest supersymmetric particle (LSP). Although the mass limit established by LEP experiments, [sup 2]M[sub [tilde W]1]>45 GeV/c[sup 2], excludes the on-shell process [anti p]p [yields] W[sup [+-]] [yields] [tilde W][sub 1] + [tilde Z][sub 2], the off-shell process W[sup [+-]] [yields] [tilde W][sub 1][tilde Z][sub 2] can have a sizeable rate due to large WW[tilde W][sub 1][tilde Z][sub 2] coupling. Here, the status of a search for the pair production of the lightest chargino and second lightest neutralino states of the minimal supersymmetric model is presented. The authors searched for four tri-lepton final states: eee, ee[mu], e[mu][mu], and [mu][mu][mu], all with missing transverse energy.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particles And Fields Proceedings Of The X Jorge Andre Swieca Summer School written by Joao Carlos Alves Barata and published by World Scientific. This book was released on 2000-06-27 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the proceedings of the X Jorge André Swieca Summer School — Particles and Fields. It includes topics on non-commutative geometry, constructive quantum field theory and duality in quantum field theory, as well as various subjects in high energy physics and phenomenology.
Download or read book Search for R parity Violating Supersymmetry Via the LL Anti E Couplings Lambda 121 Lambda 122 Or Lambda 133 in P Anti p Collisions at S written by and published by . This book was released on 2006 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for gaugino pair production with a trilepton signature in the framework of R-parity violating supersymmetry via the couplings ?121, ?122, or ?133 is presented. The data, corresponding to an integrated luminosity of L ≈ 360 pb−1, were collected from April 2002 to August 2004 with the D0 detector at the Fermilab Tevatron Collider, at a center-of-mass energy of √s = 1.96 TeV. This analysis considers final states with three charged leptons with the flavor combinations eel, ??l, and ee? (l = e or ?). No evidence for supersymmetry is found and limits at the 95% confidence level are set on the gaugino pair production cross section and lower bounds on the masses of the lightest neutralino and chargino are derived in two supersymmetric models.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Letters written by and published by . This book was released on 2001 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
